It predates modern culture by 1000 years, written about in Ancient Chinese Mythology along with the more well-known Dragon. It is thought to be the idea behind the more modern idea of a 'ninja'.
It can walk silently, and it is part of the Lokmet legend that if you steal an apple, it will come into your house while you are defecating disembowel five fully-grown goats on your bed and leave them there.
There is only one Lokmet, but others have tried to imitate it, they have become legends themselves.. some living for many thousands of years. Some may be known as Bruce Lee, Chuck Norris, BigFoot and Tekboi (if you dont know them please research it).